Polymers of intrinsic microporisty (PIMs) are an intriguing family of linear polymers. In the solid phase they have an intrinsic microporosity that arises from contortions in the ladder polymer backbone that prevents polymer chains from close packing. The result is a material with porosity that is irrespective of processing. The pores are often nanometer sized with attendant high surface area. PIMs have been widely used for gas sorption and separation. However, there are few examples of PIMs being used for liquid phase separations. We recently reported the first chiral PIM (pore size ~3.5 nm, SA 700-750 m<sup>2</sup>/g). Cast films of these materials were used for enantiomer separations in liquid solutions. These materials offer a promising low energy alternative to enantiomer separation. However, the practical application of PIMs as a separation media, regardless of gas or liquid applications, are limited due to their propensity to plasticize or swell over time resulting in loss of selectivity. My work is focused on reducing swelling and loss of selectivity through cross-linking. We are developing several modifications to stabilize and harden PIM membranes. The techniques are being used to increase cross-linking and stabilize the membranes without significant loss of selectivity or permeability, even in the presence of aggressive solvents. We also discuss methods for increasing the hydrophilicity of PIM membranes to broaden their applications in water purification.

Polymers of intrinsic microporosity: Selective membrane permeation for purification

2019 Fall National Meeting

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